Final answer:
In order for evolution to occur in a population, individuals with a trait that is naturally selected for must C) reproduce. Natural selection is the process by which organisms with traits that better enable them to adapt to their environment tend to survive and reproduce in greater numbers. This leads to changes in the traits of living things over time.
Step-by-step explanation:
In order for evolution to occur in a population, individuals with a trait that is naturally selected for must reproduce. Natural selection is the process by which organisms with traits that better enable them to adapt to their environment tend to survive and reproduce in greater numbers. This leads to changes in the traits of living things over time. For example, if a population of animals has individuals with faster running speed, those individuals are more likely to survive and have offspring with the same trait. Over generations, this trait will become more prevalent in the population.